<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-0471</journal-id>
<journal-title><![CDATA[Madera y bosques]]></journal-title>
<abbrev-journal-title><![CDATA[Madera bosques]]></abbrev-journal-title>
<issn>1405-0471</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-04712020000300200</article-id>
<article-id pub-id-type="doi">10.21829/myb.2020.2631890</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ahusamiento y volumen comercial de tres procedencias de pinos tropicales en plantaciones forestales de Veracruz, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Stem taper and merchantable volume of three provenances of tropical pines in forest plantations of Veracruz, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Ávila]]></surname>
<given-names><![CDATA[Dora]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos Posadas]]></surname>
<given-names><![CDATA[Héctor Manuel de los]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez Martínez]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamarit Urias]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo Texcoco]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Santa Rita Puebla]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>26</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-04712020000300200&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-04712020000300200&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-04712020000300200&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En los últimos años, en el sureste de México se han establecido plantaciones forestales de Pinus caribaea, que tienen como propósito la extracción de resina y la producción de madera. Ambas variables se han correlacionado positivamente con características morfológicas como la forma del fuste. Generalmente, para la descripción del perfil fustal se utilizan dos expresiones: factor de forma y ahusamiento. En este sentido, el objetivo del presente estudio fue construir un sistema de cubicación para estimar el ahusamiento y el volumen comercial de tres progenies de pinos tropicales establecidos en una plantación forestal en las Choapas, Veracruz, México, así como evaluar sus diferencias en la geometría del fuste a través de enfoque de variables indicadoras. Por medio del modelo de la variable combinada lineal y la utilización de variables indicadoras, se analizó el efecto de la procedencia en el factor de forma, encontrándose que el híbrido entre Pinus caribaea y Pinus elliotti presenta una geometría cercana al paraboloide. Se probaron diferentes modelos de ahusamiento, de los cuales, el de Demaerschalk presentó el mejor ajuste y, a partir de su integración matemática, se derivó una ecuación de volumen comercial variable, que se ajustó de manera simultánea con la de ahusamiento para generar un sistema compatible de ahusamiento-volumen comercial. Los resultados indican que el híbrido es superior en la geometría del fuste y en el volumen comercial maderable frente a las otras dos procedencias de Pinus caribaea.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In recent years in southeastern Mexico, forest plantations of Pinus caribaea have been established, whose purpose is resin extraction and wood production. Both variables have been positively correlated with morphological characteristics such as the shaft shape. Generally, two expressions are used for the description of the stem profile: form factor and taper. In this sense, the objective of the present study was to build a set equations to estimate the stem taper and merchantable volume of three progenies of tropical pines established in a forest plantation in Las Choapas, Veracruz, as well as assess their differences in the stem profile through the approach of dummy variables. Through the model of the linear combined variable and the use of dummy variables, the effect of the provenances on the form factor was analyzed, finding that the hybrid between Pinus caribaea and Pinus elliotti presents a geometry close to the paraboloid. For taper modelling the Demaerschalk model presented the best performance among the tested structures. The mathematical integration of the Demaerschalk model produces a merchantable volume equation that was simultaneously fitted with the taper expression to generate a compatible taper-volume system. The results indicate that the hybrid is superior in the geometry of the bole and in merchantable volume compared to the other two provenances of Pinus caribaea.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[factor de forma]]></kwd>
<kwd lng="es"><![CDATA[perfil fustal]]></kwd>
<kwd lng="es"><![CDATA[Pinus caribaea var]]></kwd>
<kwd lng="es"><![CDATA[hondurensis]]></kwd>
<kwd lng="es"><![CDATA[Pinus elliottii var]]></kwd>
<kwd lng="es"><![CDATA[elliottii]]></kwd>
<kwd lng="es"><![CDATA[sistema compatible]]></kwd>
<kwd lng="es"><![CDATA[variables indicadoras]]></kwd>
<kwd lng="en"><![CDATA[form factor]]></kwd>
<kwd lng="en"><![CDATA[stem profile]]></kwd>
<kwd lng="en"><![CDATA[Pinus caribaea var]]></kwd>
<kwd lng="en"><![CDATA[hondurensis]]></kwd>
<kwd lng="en"><![CDATA[Pinus elliottii var]]></kwd>
<kwd lng="en"><![CDATA[elliottii]]></kwd>
<kwd lng="en"><![CDATA[compatible system]]></kwd>
<kwd lng="en"><![CDATA[dummy variables]]></kwd>
</kwd-group>
</article-meta>
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